<template>
	<view class="chat">
		<!-- 顶部标题 -->
		<view class="topTabbar">

		</view>
		<scroll-view :style="{height: `${windowHeight-inputHeight - 180}rpx`}" id="scrollview" scroll-y="true"
			:scroll-top="scrollTop" class="scroll-view">
			<!-- 聊天主体 -->
			<view id="msglistview" class="chat-body">

				<!-- 聊天记录 -->
				<view v-for="(item,index) in msgList" :key="index">
				
				
					<!--自己发送的问题-->
					<view v-if="item.sender==='user'" style="display: flex; justify-content: flex-end; margin: 5px 10px;">
						<view style="background-color: #409EFF; border-radius: 8px;">
							<view style="padding: 17rpx 20rpx; color: #f1f1f1;">
								<text style="word-break: break-all;">{{item.content}}</text>
							</view>
						</view>
					
						<view
							style="background-color:#409EFF; border-radius: 50px; width: 35px; height:35px;margin-top: 5px; margin-left: 10px;">
							<u-image width="30" height="30" src="@/static/user.png"></u-image>
						</view>
					</view>

					<!--机器人回复-->
					<view v-if="item.sender=='ai'"
						style="display: flex;flex-direction: column; align-items: start; padding-bottom: 10px; padding-left: 10px;">
						<view style="display: flex;height: 35px; line-height:35px;">
							<view><u-image width="30" height="30" src="@/static/logo.png"></u-image></view>
							<text>耒耜AI小助手</text>
						</view>
						<view
							style="display: flex; flex-direction: column;  background: #ebebeb;border-radius: 8px; margin-right: 10px;">
							<view style="padding: 17rpx 20rpx;">
								<u-parse :content="item.content" v-if="item.waiting==0"></u-parse>
								<u-loading-icon textSize="18" v-if="item.waiting==1"
									style="width: 40px;"></u-loading-icon>
							</view>

							<!--消息底部功能按钮-->
							<view style="margin: 5px; display: flex;justify-content:flex-end;" v-if="item.waiting==0">
								<u-icon @click="copyContent(item.content)" name="order" color="#cfcfd1"
									size="22"></u-icon>
							</view>
						</view>
					</view>
				</view>
			</view>
		</scroll-view>
		<!-- 底部消息发送栏 -->
		<!-- 用来占位，防止聊天消息被发送框遮挡 -->
		<view class="chat-bottom" :style="{height: `${inputHeight}rpx`}">
			<view class="send-msg" :style="{bottom:`${keyboardHeight - 60}rpx`}">
				<view class="uni-textarea">
					<input v-model="chatMsg" maxlength="300" confirm-type="send" @confirm="handleSend"
						placeholder="快来聊天吧~" :show-confirm-bar="false" :adjust-position="false" @linechange="sendHeight"
						@focus="focus" @blur="blur" auto-height></input>
				</view>
				<button @click="handleSend" class="send-btn">发送</button>
			</view>
		</view>
	</view>
</template>
<script>
	export default {
		data() {
			return {
				//键盘高度
				keyboardHeight: 0,
				//底部消息发送高度
				bottomHeight: 0,
				//滚动距离
				scrollTop: 0,
				userId: '',
				//发送的消息
				chatMsg: "",
				msgList: [{
						sender: 'ai',
						content: 'Hi，我是耒耜，很高兴认识你！<br/>应用商店搜索“耒耜大模型”随时和我聊天！',
						waiting: 0
					}, {
						sender: 'user',
						content: '你好啊！',
						waiting: 0
					},
					{
						sender: 'ai',
						waiting: 0,
						content: "你好啊，很高兴你可以关注我，请问我有什么可以帮助你的吗？"
					},
					{
						sender: 'user',
						content: '今天天气怎么样？',
						waiting: 0,
					},
					{
						sender: 'ai',
						content: "今天天气很晴朗，可以出去晒太阳",
						waiting: 0
					},
					{
						sender: 'user',
						waiting: 0,
						content: '你好呀，非常高兴认识你'
					},
					 
					{
						sender: 'ai',
						content: "嗯，我也是，真得很高兴认识你！",
						waiting: 0
					}
				]
			}
		},
		updated() {
			//页面更新时调用聊天消息定位到最底部
			this.scrollToBottom();
		},
		computed: {
			windowHeight() {
				return this.rpxTopx(uni.getSystemInfoSync().windowHeight)
			},
			// 键盘弹起来的高度+发送框高度
			inputHeight() {
				//return this.bottomHeight+this.keyboardHeight;
				return this.keyboardHeight
			}
		},
		onLoad() {
			uni.onKeyboardHeightChange(res => {
				//这里正常来讲代码直接写
				//this.keyboardHeight=this.rpxTopx(res.height)就行了
				//但是之前界面ui设计聊天框的高度有点高,为了不让键盘和聊天输入框之间距离差太大所以我改动了一下。
				this.keyboardHeight = this.rpxTopx(res.height)
				if (this.keyboardHeight < 0) this.keyboardHeight = 0;
			})
		},
		onUnload() {
			// uni.offKeyboardHeightChange()
		},
		methods: {
			focus() {
				this.scrollToBottom()
			},
			blur() {
				this.scrollToBottom()
			},
			// px转换成rpx
			rpxTopx(px) {
				let deviceWidth = uni.getSystemInfoSync().windowWidth
				let rpx = (750 / deviceWidth) * Number(px)
				return Math.floor(rpx)
			},
			// 监视聊天发送栏高度
			sendHeight() {
				setTimeout(() => {
					let query = uni.createSelectorQuery();
					query.select('.send-msg').boundingClientRect()
					query.exec(res => {
						this.bottomHeight = this.rpxTopx(res[0].height)
					})
				}, 100)
			},
			// 滚动至聊天底部
			scrollToBottom(e) {
				setTimeout(() => {
					let query = uni.createSelectorQuery().in(this);
					query.select('#scrollview').boundingClientRect();
					query.select('#msglistview').boundingClientRect();
					query.exec((res) => {
						if (res[1].height > res[0].height) {
							this.scrollTop = this.rpxTopx(res[1].height - res[0].height)
						}
					})
				}, 15)
			},
			// 发送消息
			handleSend() {
				//如果消息不为空
				if (!this.chatMsg || !/^\s+$/.test(this.chatMsg)) {
					let obj = {
						sender: "user",
						content: this.chatMsg
					}
					this.msgList.push(obj);
					this.chatMsg = '';
					this.scrollToBottom()
				} else {
					this.$modal.showToast('不能发送空白消息')
				}
			},
		}
	}
</script>
<style lang="scss" scoped>
	$chatContentbgc: #C2DCFF;
	$sendBtnbgc: #4F7DF5;

	view,
	button,
	text,
	input,
	textarea {
		margin: 0;
		padding: 0;
		box-sizing: border-box;
	}

	/* 聊天消息 */
	.chat {
		.topTabbar {
			width: 100%;
			height: 10rpx;
			line-height: 10rpx;
			display: flex;
			justify-content: space-between;
		}

		.scroll-view {
			::-webkit-scrollbar {
				display: none;
				width: 0 !important;
				height: 0 !important;
				-webkit-appearance: none;
				background: transparent;
				color: transparent;
			}

			// background-color: orange;
			background-color: #ffffff;

			.chat-body {
				display: flex;
				flex-direction: column;
				padding-top: 23rpx;
				// background-color:skyblue;

				.self {
					justify-content: flex-end;
				}

				.item {
					display: flex;
					padding: 23rpx 30rpx;
					// background-color: greenyellow;

					.right {
						background-color: $chatContentbgc;
					}

					.left {
						background-color: #FFFFFF;
					}

					// 聊天消息的三角形
					.right::after {
						position: absolute;
						display: inline-block;
						content: '';
						width: 0;
						height: 0;
						left: 100%;
						top: 10px;
						border: 12rpx solid transparent;
						border-left: 12rpx solid $chatContentbgc;
					}

					.left::after {
						position: absolute;
						display: inline-block;
						content: '';
						width: 0;
						height: 0;
						top: 10px;
						right: 100%;
						border: 12rpx solid transparent;
						border-right: 12rpx solid #FFFFFF;
					}

					.content {
						position: relative;
						max-width: 486rpx;
						border-radius: 8rpx;
						word-wrap: break-word;
						padding: 24rpx 24rpx;
						margin: 0 24rpx;
						border-radius: 5px;
						font-size: 32rpx;
						font-family: PingFang SC;
						font-weight: 500;
						color: #333333;
						line-height: 42rpx;
					}

					.avatar {
						display: flex;
						justify-content: center;
						width: 78rpx;
						height: 78rpx;
						background: $sendBtnbgc;
						border-radius: 50rpx;
						overflow: hidden;

						image {
							align-self: center;
						}

					}
				}
			}
		}

		/* 底部聊天发送栏 */
		.chat-bottom {
			width: 100%;
			height: 60rpx;
			background: #F4F5F7;
			transition: all 0.1s ease;

			.send-msg {
				display: flex;
				align-items: flex-end;
				padding: 16rpx 30rpx;
				width: 100%;
				min-height: 177rpx;
				position: fixed;
				bottom: 0;
				background: #fff;
				transition: all 0.1s ease;
			}

			.uni-textarea {
				padding-bottom: 70rpx;

				input {
					width: 537rpx;
					min-height: 75rpx;
					max-height: 500rpx;
					background: #f1f1f1;
					border-radius: 40rpx;
					font-size: 32rpx;
					font-family: PingFang SC;
					color: #333333;
					line-height: 74rpx;
					padding: 5rpx 8rpx;
					text-indent: 30rpx;
				}
			}

			.send-btn {
				display: flex;
				align-items: center;
				justify-content: center;
				margin-bottom: 76rpx;
				margin-left: 25rpx;
				width: 120rpx;
				height: 75rpx;
				background: #ed5a65;
				border-radius: 50rpx;
				font-size: 28rpx;
				font-family: PingFang SC;
				font-weight: 500;
				color: #FFFFFF;
				line-height: 28rpx;
			}
		}
	}
</style>